Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)

Transcription

1 Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs) Title: [Kookmin University Response to 15.7r1 CFA: Applications of OWC] Date Submitted: [March, 2015] Source: [Md. Shareef Ifthekhar, Trang Nguyen, Nirzhar Saha, Nam Tuan Le, Mohammad Arif Hossain, Chang Hyun Hong, Yeong Min Jang and Jae Sang Cha] [Kookmin University, SeoulTech] Address [Kookmin University, Seoul, Korea] Voice:[ ], FAX: [ ], Re: [] Abstract: Purpose: Call for Application Response Notice: This document has been prepared to assist the IEEE P It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P Yeong Min Jang, Kookmin University

2 Kookmin University Response to 15.7r1 CFA: Applications of OWC Yeong Min Jang Slide 2

3 Contents Data decoding procedure of OWC Asynchronous rolling shutter based OWC LBS application Internet of LED Conclusion Slide 3

4 Data Decoding Procedure of OWC Camera based OWC Rolling shutter operation Global shutter operation Exposure time Rolling image Image #1 Exposure time Image #2 Image #3 Image #4 Global images Rolling shutter sequentially exposes each row of the image sensor. Thus when the LED is on, the output of the exposed row will be a white band (bit 1). On the contrary, when the LED is off the output of the exposed row will be a black band (bit 0). Global shutter exposes whole part of the image sensor simultaneously. When LED is on, the whole frame will give a bright band (bit 1), and a dark band while it is off (bit 0). Therefore, in each frame only single bit information can be received Also PD can be used to decode data in OWC Slide 4

5 Comparison Between Different OWC Receiver Tech item Rolling shutter Global shutter PD Operation Sequentially exposes each raw of image sensor All pixels are exposed at the same time SNR High Low High Skew Wobble Data rate Appears due to the horizontal motion of a camera Appears due to vertical motion of a camera Rolling shutter effect can be used to increase data rate No No Exposure time MIMO can be used to increase data rate The standard provides PHY for supporting Rolling shutter and global shutter camera for OCC Always being exposed and no frame sampling No No By increasing LED modulating frequency Slide 5

6 Asynchronous LED-to-Rolling shutter camera based OWC LED acts as transmitter Short distance: Data rate achieved = 600bps 3m distance: Data rate achieved = 8bps User Interface of near-field OCC receiver (600bps) User Interface of far-distance OCC receiver (8bps) Asynchronous Scheme is applied for unidirectional communication, mitigating variation in camera frame rate 600bps data rate achieved at short distance 3m distance can be achieved by transmitting low speed. Slide 6

7 OWC based Positioning Transmission of ID (coordinate) through LEDs Camera can be used to decode ID information. Triangulation method along with LEDs ID are used to determine user s position. Some legacy positioning methods for OCC are TOA TDOA AOA RSS Cell ID Slide 7

8 LBS application (Location Based Link Switching) Device Estimate and save the location information Location server Send link switching response Video Server Location Server IP Network Data Server Coordinator (x 4, y 4, z 4) LED 4 LED (x 3, y 3, z 3) NO Received signal is less than a threshold? (x 1, y 1, z 1) LED 1 LED 2 (x 2, y 2, z 2) NO YES Send link switching request Device s movement history is in link switching table? YES P u, v, k, k Pbackwards? Device (x, y, z) Scan target LEDs to find the best one NO Predict the future location of device YES Choose candidate LEDs y LED LED Send disassociation message to serving LED Communicate with best target LED Generate list of target LEDs Send target LEDs information to device y 2 y 1 a LED LED Serving LED a Slide 8 O x 1 x r1 (Various) x

9 Positioning and Navigation using OWC Location Information Coordinat or Tx # N PLC Tx # N-1 Tx # 3 IP Network Streaming Server Tx # 2 Tx # 1 Mobile # N Mobile # 2 Mobile # 1 Indoor navigation Guiding in museum scenario Products information marketing Slide 9

10 Internet of LED (IoL) Network Model considered Internet Room temp Food quality and quantity update Transmission medium visible light Functional architecture compatibility IEEE r1 (Ongoing standardization) Supported network topology star, peer-topeer and broadcasting Coordinator mainly network operation and resource allocation PLC or PON as backhaul Home gateway (HGW) connects indoor networked devices with internet Application server Tag# 1 Washing Machine PLC Network Coordinator Tag# 2 FOV Reader HGW Refrigerator PON Tag# (n-1) Tag# n Air-condition User can control networked devices in home with an app Slide 10

11 LED-ID: Reader-Tag Operation in IoL Two different modes: ID-Detection mode and data reception mode ID-Detection (IDD) operation is completed in CAP mode Wake up Beacon Request Resource allocation Tag wakes up when readers send request Tag will be synchronized by superframe Reader request traffic Tag allocates slots based on reader s request ID detection mode Data reception mode READER Wakeup Signal ID and Mode Selection Mode Change Request Mode Selection Beacon (ID, mode) Data Request TAG Authentication/ Certification and media consulation Resource Block Allocation Communication Beacon (Superframe information) Data send Beacon Generation Send request and service information Acknowledgement Coordinator Beacon Generation Data send Management Platform of IoL Data Transmission Data transmission using allocated slot Ending order Release of communication link Slide 11

12 Connected Object Domain in IoL: An Application Perspective Vehicle to infrastructure communication (car sending real time traffic update) Coordinator Inter-vehiculer communication (collision avaoidance) Internet Infrastructure to vehicle communication (navigation) Traffic information broadcast (traffic rerouting) ITS Cloud Server Data Server Wireless Printer Laptop High speed internet Tablet PDA Multimedia Application, Social Networking, and Gaming Cellular Application in Smart phone Green ITS based on VLC Smart Home and Office Access Point(AP) Cellular Base Station Core Network Private Server Internet Backhaul LED traffic Information (traffic, light news, travel, weather) broadcast Local destination information and e- ticketing Travel destination and tourist attraction information Outdoor LiFi Hotspot Internet Backhaul access (PLC/Optical fiber) Smart phone Sale! 50% e-coupon Smart phone Outdoor Line-of-sight Marketing Saha, N.; Ifthekhar, M.S.; Mondal, R.K.; Hosain, M.A.; Yeong Min Jang, "The internet of LED: A LED-ID based interoperability and interconnectivity perspective," ICTC2014, vol., no., pp.535~540, Oct Slide 12

13 Conclusion Need PHY for bidirectional and unidirectional communication Need PHY for rolling shutter and global shutter camera Need application dependable PHY and MAC Need to have a link switching functionality Need to put the IoT concept using LED, digital signage, display and Need to have a LED-ID operation Slide r1 (Various)